The reason why the ledger that Yoshitoki holds in his hand was a “wooden letter” ~ it was super important in Togoku, where the spread of paper was slow

In an age where smartphones and PCs are at their peak, there are things that seem to go out of fashion and will never happen. It's stationery. There is dedicated software and Excel for keeping books, and Word is enough for writing sentences. Pencils, ballpoint pens, etc. don't seem to come into play anymore, and there are probably many people who use specialty fountain pens and notebooks. This trend was the same from the late Heian period to the…